Which factors govern the rate of primary productivity in freshwater and marine ecosystems?
a. availability of water
b. availability of sunlight and nutrients only
c. depth of the water only
d. depth of the water and availability of sunlight and nutrients
e. availability of oxygen
ANSWER: d
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Research has found little evidence that increased in the number of citizens with concealed handgun permits reduce or increase rates of violent crime.
Answer the following statement(s) true (T) or false (F)
Phylogenetic stains, such as those used in FISH, hybridize with
A) ribosomal RNA. B) mitochondrial DNA. C) nuclear DNA. D) RNA polymerase.
West Nile virus has been detected in ________ states of the United.States.
A. 50 B. 10 C. 25 D. 47
When testing the effectiveness of a new cleaning product, which sample would be more valid? a. 222 bacteria in the Petri dish b. None of the samples are valid
c. 14 bacteria in the Petri dish d. All samples are equally valid. e. 3 bacteria in the Petri dish